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Iridium is a stable metal that chemically unreactive, like platinum and gold. Iridium is the most resistant to oxidation of all metals. It can be used is as a hardening agent in alloys with Platinum and Osmium. Sometimes used in medical therapies e.g. treating prostate cancer by radiation therapy.
Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air.atural rubidium is a mix of two isotopes: 85 Rb, the only stable one, constitutes 72% of it. The remaining 28% is the slightly radioactive 87 Rb with a half-life of 49 billion yearsâmore than three times longer than the estimated age of the universe.